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//// FLEXWebViewController.m// Flipboard//// Created by Ryan Olson on 6/10/14.// Copyright (c) 2014 Flipboard. All rights reserved.//
#import "FLEXWebViewController.h"#import "FLEXUtility.h"#import <WebKit/WebKit.h>
@interface FLEXWebViewController () <WKNavigationDelegate>
@property (nonatomic) WKWebView *webView;@property (nonatomic) NSString *originalText;
@end
@implementation FLEXWebViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{ self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { WKWebViewConfiguration *configuration = [WKWebViewConfiguration new];
if (@available(iOS 10.0, *)) { configuration.dataDetectorTypes = UIDataDetectorTypeLink; }
self.webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:configuration]; self.webView.navigationDelegate = self; } return self;}
- (id)initWithText:(NSString *)text{ self = [self initWithNibName:nil bundle:nil]; if (self) { self.originalText = text; NSString *htmlString = [NSString stringWithFormat:@"<head><meta name='viewport' content='initial-scale=1.0'></head><body><pre>%@</pre></body>", [FLEXUtility stringByEscapingHTMLEntitiesInString:text]]; [self.webView loadHTMLString:htmlString baseURL:nil]; } return self;}
- (id)initWithURL:(NSURL *)url{ self = [self initWithNibName:nil bundle:nil]; if (self) { NSURLRequest *request = [NSURLRequest requestWithURL:url]; [self.webView loadRequest:request]; } return self;}
- (void)dealloc{ // WKWebView's delegate is assigned so we need to clear it manually. if (_webView.navigationDelegate == self) { _webView.navigationDelegate = nil; }}
- (void)viewDidLoad{ [super viewDidLoad]; [self.view addSubview:self.webView]; self.webView.frame = self.view.bounds; self.webView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; if (self.originalText.length > 0) { self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Copy" style:UIBarButtonItemStylePlain target:self action:@selector(copyButtonTapped:)]; }}
- (void)copyButtonTapped:(id)sender{ [UIPasteboard.generalPasteboard setString:self.originalText];}
#pragma mark - WKWebView Delegate
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{ WKNavigationActionPolicy policy = WKNavigationActionPolicyCancel; if (navigationAction.navigationType == WKNavigationTypeOther) { // Allow the initial load policy = WKNavigationActionPolicyAllow; } else { // For clicked links, push another web view controller onto the navigation stack so that hitting the back button works as expected. // Don't allow the current web view to handle the navigation. NSURLRequest *request = navigationAction.request; FLEXWebViewController *webVC = [[[self class] alloc] initWithURL:[request URL]]; webVC.title = [[request URL] absoluteString]; [self.navigationController pushViewController:webVC animated:YES]; } decisionHandler(policy);}
#pragma mark - Class Helpers
+ (BOOL)supportsPathExtension:(NSString *)extension{ BOOL supported = NO; NSSet<NSString *> *supportedExtensions = [self webViewSupportedPathExtensions]; if ([supportedExtensions containsObject:[extension lowercaseString]]) { supported = YES; } return supported;}
+ (NSSet<NSString *> *)webViewSupportedPathExtensions{ static NSSet<NSString *> *pathExtensions = nil; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ // Note that this is not exhaustive, but all these extensions should work well in the web view. // See https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/CreatingContentforSafarioniPhone/CreatingContentforSafarioniPhone.html#//apple_ref/doc/uid/TP40006482-SW7 pathExtensions = [NSSet<NSString *> setWithArray:@[@"jpg", @"jpeg", @"png", @"gif", @"pdf", @"svg", @"tiff", @"3gp", @"3gpp", @"3g2", @"3gp2", @"aiff", @"aif", @"aifc", @"cdda", @"amr", @"mp3", @"swa", @"mp4", @"mpeg", @"mpg", @"mp3", @"wav", @"bwf", @"m4a", @"m4b", @"m4p", @"mov", @"qt", @"mqv", @"m4v"]]; }); return pathExtensions;}
@end
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